MPA Electrical B1139 Power Brake Booster

Overview

This remanufactured vacuum power brake booster is built for direct brake assist replacement where the master cylinder is not included. MPA Electrical part B1139 is engineered to deliver strong vacuum-assisted braking with reduced pedal effort, and it is tested at the end of production for consistent output.

Compatible with Dodge Ram 1500 Van, Ram 2500 Van, Ram 3500 Van, B1500, B2500, and B3500 applications listed below, this booster supports reliable pressure transfer in standard replacement service. The B1139 brake booster is a practical choice for restoring braking feel on Dodge Ram van and B-series truck platforms.

Key Features

• Vacuum booster design for power-assisted braking
• Remanufactured standard replacement unit
• Metal housing construction
• 10.95 in. diaphragm diameter
• 3/8-16 master cylinder stud thread size
• Two mounting studs for installation
• Master cylinder, gasket, seal, and pedal rod extension not included

Detailed Description

MPA Electrical B1139 is a remanufactured power brake booster engineered for vehicles that use a vacuum-assisted brake system. The unit is built with treated replacement components to support vacuum sealing and pressure transfer, while 100% end-of-line testing helps verify performance before shipment. As a brake booster for Dodge Ram 1500 Van, Ram 2500 Van, Ram 3500 Van, B1500, B2500, and B3500 fitments, it is suited to restoring brake assist when the original booster has weakened or failed.

This part cross-references Mopar (e.g., 4897211AB, 5101892AA) for the same application. Part number B1139 should be matched to the vehicle’s brake system configuration before installation.

What It Helps Fix

• Hard brake pedal feel
• Reduced brake assist
• Vacuum seal loss in the booster
• Weak or inconsistent pedal response
• Brake system performance loss from a worn booster

Installation Notes

Verify master cylinder compatibility, stud thread size, and mounting layout before installation. This booster does not include a master cylinder, gasket, seal, mounting bracket, or brake pedal rod extension. Confirm the vehicle’s brake system condition and vacuum supply so the replacement booster can operate correctly.

Quality Assurance

MPA Electrical subjects each unit to 100% end-of-line testing using proprietary equipment. Part number B1139 is remanufactured to standard replacement specifications for consistent brake assist performance.